LVirrelevant mob in tah<tab>
Stone5, earth weather, bonus from back/waist
Terra's staff - 2526
Chatoyant staff - 2913
Fire5, no day/weather bonus
Chatoyant staff - 2842
Blizzard5, no day/weather bonus
Chatoyant staff - 3086
Magian staff(+6) - 3586
Blizzard5, iceday, no bonus from back/waist/legs
Chatoyant staff - 3086 3082 3082 3082 3082 3082 3216 3216 3389 3389 3537
(sorted to make it easier to read)
Blizzard5, iceday, bonus from waist
Chatoyant staff - 3343 3343
Blizzard5, iceday, bonus from back/waist/legs
Chatoyant staff - 3466
Magian staff - 4028
Going back to the blizzard5/iceday/no back/waist/legs part, and given that I'm using +79mab, with 40 natural, = 119mab total
3086 / (100+79+40) * (100+79+40+10) = 3226
So the damage in the 3216 range is from magic crit
3389 / (100+79+40) * (100+79+40+10) = 3543
And the damage in the 3537 range is from random ice day proc + magic crit
3389 is from random ice day proc alone, since it matches the damage you get when you force day-bonus using the obi.
....
Basically, after thunder/ice spells(since you're using magian staves for those at the minimum,
right?, this staff makes the current day spell the best most powerful spell. I should check chatoyant+fire spell+fireday vs magian staff+ice spell+non-ice day, but that's not for another few hours.
Hope that wasn't too confusing to read.